Coordinates above are a placeholder (Castilla-La Mancha, ES). Swap in each pivot's real lat/lng/radius. The arm's live angle comes from Corvina via a scheduled scrape (~every 15 min) — not instant, but far more current than any satellite pass. If the arm's direction looks rotated relative to reality, nudge "Angle offset" until it matches.
Base reference
Esri World Imagery
~1m in most areas · static archive, not live
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Free live sources · sorted by most recent pass
All of these are free, no signup, no key. Cards re-sort themselves as fresher passes come in — whichever has the most recent image for your field floats to the top. 250m sources (VIIRS/MODIS) show field-level color/moisture patterns; the 30m/radar sources below them are sharper but revisit less often. Sentinel-2 below (10m) is the sharpest — that one needs a free account.
High-res upgrade (optional)
Sentinel-2 (Copernicus)
10m resolution · ~5 day revisit · sharp enough to see pivot circles clearly
This tier needs a free Sentinel Hub / Copernicus account (no credit card for the free tier). Once you have one, paste your instance ID above and the 10m imagery layers in live — same map, same toggle system.
All sources run independently. When Sentinel-2 is clouded out, VIIRS/MODIS still update daily — that's the "combine sources" idea: more total updates than any one satellite gives you alone.